High-speed microscopic camera technology was utilized to observe and research the micro-scale suspend droplet combustion process of aviation kerosene RP-3. The basic mechanism of micro bubble nucleation inside droplet and manifestation were analyzed. Under convex curvature induced nucleation mechanism at low pressure

three forms of nucleation which were confirms were including:(1) Nucleation in the interface of the suspended silk/droplet. The temperature of suspended silk was higher than the droplet temperature on interface

and temperature difference induced the evaporation effect to form the micro bubbles nucleation.(2) Nucleation in the interface of the particles/droplet. Several micrometer range filiform or globular impurity particles or colloid particles inside droplet that form convex curvature side to induce meiobar

in which burgeon bubbles nucleation points.(3) Nucleation on pits of droplet surface. Heavy components form the raft structure and the line tension and surface tension of the droplet surface side simultaneous effect cause indent of the droplet surface

which sprout bubbles nucleation points in the convex curvature side of the pit.These developments laid the foundation for further research on micro-scale combustion.